Rainbow-electronics MAXQ2010 Manual do Utilizador descarregar pdf (Página 29)

MAXQ2010

16-Bit Mixed-Signal Microcontroller with LCD

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A simple LCD-segmented glass interface example

demonstrates the minimal hardware required to inter-

face to a MAXQ2010 microcontroller. A two-character

LCD is controlled, with each character containing

seven segments plus decimal point. The LCD controller

is configured for 1/2 duty-cycle operation, meaning the

active segment is controlled using a combination of

segment signals and COM0 or COM1 signals are used

to select the active display. See Figure 8.

In-Circuit Debug

Embedded debugging capability is available through

the JTAG-compatible TAP. Embedded debug hardware

and embedded ROM firmware provide in-circuit debug-

ging capability to the user application, eliminating the

need for an expensive in-circuit emulator. Figure 9

shows a block diagram of the in-circuit debugger. The

in-circuit debug features include the following:

• A hardware debug engine.

• A set of registers able to set breakpoints on register,

code, or data accesses.

• A set of debug service routines stored in the utility

ROM.

The embedded hardware debug engine is an indepen-

dent hardware block in the microcontroller. The debug

TAP

CONTROLLER

CPU

DEBUG

ENGINE

DEBUG

SERVICE

ROUTINES

(UTILITY ROM)

CONTROL

BREAKPOINT

ADDRESS

DATA

TMS

TCK

TDI

TDO

MAXQ2010

Figure 9. In-Circuit Debugger

SEG0

SEG1

SEG2

SEG3

COM0

SEG[0:7]

CONNECTED TO DARK GREY SEGMENTS

COM1

CONNECTED TO LIGHT GREY SEGMENTS

SEG4

SEG5

SEG6

SEG7

MAXQ2010

Figure 8. Two-Character, 1/2 Duty, LCD Interface Example

1 2 ... 24 25 26 27 28 29 30 31 32 33

MAXQ2010 1

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